CN111707022B - Capillary steam-mixing super-cavitation jet noise suppression device - Google Patents
Capillary steam-mixing super-cavitation jet noise suppression device Download PDFInfo
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- CN111707022B CN111707022B CN202010426518.7A CN202010426518A CN111707022B CN 111707022 B CN111707022 B CN 111707022B CN 202010426518 A CN202010426518 A CN 202010426518A CN 111707022 B CN111707022 B CN 111707022B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
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Abstract
The invention relates to a capillary tube steam-mixing super-cavitation jet noise suppression device, which is characterized in that refrigerant gas in the middle of an evaporator is introduced into an outlet of a capillary tube through a bypass capillary tube, so that the refrigerant which flows out of the capillary tube and enters the evaporator is mixed with steam, the local pressure of a steam mixing area is improved, the cavitation number is effectively reduced, the pressure of cavitation bubble collapse is obviously reduced, the super-cavitation phenomenon is formed, and cavitation noise is greatly reduced; the mixed refrigerant flows into the evaporator again to complete the circulation; compared with the traditional silencer, the silencer has the advantages of simple structure, convenient processing and installation, low later maintenance cost and the like; the invention has wide application, is not only suitable for common refrigerating devices such as refrigerators, air conditioners and the like, but also can be used for refrigerating systems in the fields of machinery, metallurgy, petroleum, chemical industry, food preservation, artificial environment, biological pharmacy and the like.
Description
Technical Field
The invention relates to a novel jet noise reduction restraining device, in particular to a device which introduces refrigerant gas in the middle of an evaporator into an outlet of a capillary tube through a bypass capillary tube, so that the refrigerant gas which flows out of the capillary tube and enters the evaporator is mixed with steam, the local pressure of a steam mixing area is improved, the cavitation number is effectively reduced, the pressure of cavitation bubble collapse is obviously reduced, the supercavitation phenomenon is formed, and the cavitation noise is greatly reduced. The mixed refrigerant flows into the evaporator again to complete the circulation.
Background
The noise research of the refrigeration system shows that besides the mechanical noise and the electromagnetic noise of the compressor, the flow noise of the system directly affects the noise of the refrigeration system and the sound quality parameters of the refrigeration system, and the group of cavitation bubbles caused by cavitation erosion of the outlet (the inlet of the evaporator) of the capillary tube collapse, and the generated micro-shock flow and shock wave phenomena are the main sources of cavitation burst noise. When a refrigerant flows out of a capillary tube and enters an evaporator, due to the influences of pipeline structure change, refrigerant dryness and flow resistance, at an inlet of the evaporator, due to the fact that the flow cross section area of the refrigerant is suddenly enlarged, the flow state is in a jet shape, a plurality of vortex areas are formed in an inlet area, due to the fact that the outlet cross section is suddenly enlarged, the pressure of the vortex areas is low, meanwhile, a large number of bubbles are generated and are broken at a high-pressure place, the phenomenon is called cavitation erosion, and a large number of bubble burst noises are the main reasons for noise generation at an outlet of a throttling device. Refrigerant gas with the refrigerant pressure of an evaporator inlet pipe and the middle part higher than the pressure of a capillary tube ejection outlet is introduced into the capillary tube outlet by utilizing the bypass capillary tube, and the super-cavitation phenomenon is formed by mixing the refrigerant gas, so that the local pressure is improved, the cavitation number is effectively reduced, the pressure of cavitation bubble collapse is obviously reduced, and the cavitation noise is greatly reduced. The effect of reducing the whole noise pollution of the refrigerating system is achieved.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the technical problems of overlarge fluctuation of flowing noise, large integral sound power and the like in the circulating device of the existing small-sized refrigerating system, the silencer which does not influence the refrigerating effect and can effectively reduce the jet noise at the outlet of the throttling device is designed, is simple and easy to operate, thereby improving the sound quality of the whole refrigerating system and reducing the noise pollution.
The theoretical basis of the invention is as follows: experiments and researches are carried out by a large number of scholars, and a conclusion is drawn that the local pressure of a steam mixing area can be improved by mixing steam, the cavitation number is effectively reduced, the pressure of cavitation bubble collapse is obviously reduced, the cavitation noise is greatly reduced, when the cavitation number is reduced to a certain degree (the basic characteristic of supercavitation), the noise level is reduced, and because the pressure is reduced to be below the saturated vapor pressure of a medium, the cavitation bubbles cannot be completely collapsed, and the explosion noise is greatly reduced.
The technical scheme adopted by the invention is as follows: on the basis of a conventional refrigerating system, a bypass capillary tube is connected between an outlet of a throttling device, an inlet tube of an evaporator and the front middle part of the evaporator, and a gaseous refrigerant with pressure slightly higher than the injection pressure of the capillary tube in the inlet tube of the evaporator flows back to the outlet of the throttling device along the bypass capillary tube to mix steam locally to form a supercavitation phenomenon, so that extra noise (high-frequency sharp noise of cavitation collapse) generated by low local pressure at the outlet of the throttling device is reduced. The refrigerant in the bypass pipe is merged and then flows back to the interior of the evaporator, and the refrigerant circulation is completed.
The invention relates to a refrigeration system for reducing jet noise by using a bypass capillary on an evaporator, namely on the basis of ensuring a performance coefficient, on the basis of reducing the jet noise of a capillary outlet, a bypass pipe is added on the basis of the original common refrigeration system, refrigerant gas in the front middle part of the evaporator is introduced into the capillary outlet, the vapor is mixed to form a supercavitation phenomenon, and the merged refrigerant gas flows back to the evaporator to complete circulation. The device can reduce the noise intensity of the outlet (the inlet of the evaporator) of the capillary tube and improve the sound quality of the refrigerating system.
The capillary steam-mixing supercavitation jet noise suppression device comprises a throttling capillary, an evaporator inlet transition pipe and 1-4 bypass capillaries, wherein two ends of each bypass capillary are communicated with the evaporator inlet transition pipe to form a bypass loop, and the distance between two ports of each bypass loop is 40-480 mm.
The refrigerant in the capillary steam-mixing super-cavitation jet noise suppression device is throttled by the capillary tube, then is jetted out of the capillary tube at a high speed and enters the evaporator, at the moment, because the flow speed of the refrigerant is very high (choked flow is possibly formed, and correspondingly, the outlet speed of a refrigerant gas-liquid mixture is supersonic speed), local low pressure is formed at the outlet of the capillary tube, a large amount of bubbles are generated, and then cavitation is carried out, so that cavitation noise is generated. The refrigerant steam with slightly high pressure at the front end, the middle part and the tail part of the evaporator is introduced into the low-pressure outlet of the evaporator by utilizing the bypass capillary tube to form the outlet air-entraining supercavitation effect of the throttling capillary tube. The refrigerant gas-liquid is mixed and then flows back to the evaporator for evaporation, and the refrigeration cycle is completed. The connection mode of each part is oxygen welding.
The bypass capillary tube is connected with the evaporator, the inner diameter of the bypass capillary tube is 0.5-3.5mm, the length of the bypass capillary tube extending into the evaporator is 5-250 mm, and the number of the bypass throttling capillary tubes is 1-4.
One end of each bypass capillary tube is inserted from the tube wall above the inlet of the evaporator, the distance between the insertion opening and the inlet end is 5mm-30mm, the length is 0.5mm-5mm, a welded connection mode is adopted, one end of each bypass capillary tube is inserted from the upper part of the tube wall of the front middle part of the evaporator, the inner diameter of each bypass capillary tube is 0.5-3.5mm, the insertion length is 0.5mm-2mm, the length of each bypass capillary tube is 50mm-500mm, and the bypass capillary tubes are connected in a welded connection mode and are 1-4 in number.
The inner diameter of the evaporator pipeline is 2mm-50mm, the wall thickness is 0.5mm-3mm, and the length is 50mm-20000 mm.
The tube material is a copper tube, a Bundy tube and a metal pipeline which can be used in a refrigerating system.
The device is arranged at the inlet of the evaporator, and the noise at the inlet of the evaporator is reduced and the sound quality of a refrigerating system is improved by destroying a local injection low-pressure area formed by the outlet of the throttling capillary tube (the inlet of the evaporator).
The bypass capillary tube air-mixing supercavitation device in the capillary tube air-mixing supercavitation jet noise suppression device can be applied to all places containing throttling jet, not only can be applied to a vapor compression type refrigeration system, but also can be applied to any system with a throttling device, and the purpose of noise reduction and silencing can be achieved.
The invention has the beneficial effects that: the invention fully utilizes the theoretical basis of steam-mixing supercavitation dynamics and the like, so that the local pressure at the inlet of the evaporator at the outlet of the throttling device is increased, and the supercavitation phenomenon is formed; researches and experiments show that the local pressure of a steam mixing area can be improved, the cavitation number can be effectively reduced, and the pressure during collapse of cavitation bubbles can be obviously reduced, so that the cavitation noise at the outlet (the inlet of an evaporator) of a capillary tube of a refrigeration system can be obviously reduced, and the acoustic quality can be improved; in addition, the invention has the advantages of simple structure, convenient processing and installation, low cost, low later maintenance cost and the like.
Drawings
FIG. 1 is a schematic connection diagram 1 of a capillary steam-mixing supercavitation jet noise suppression device according to the present invention;
FIG. 2 is a schematic connection diagram of a capillary steam-mixing supercavitation jet noise suppression device according to the present invention 2;
in the figure: 1-throttling capillary tube, 2-evaporator inlet transition tube, 3-bypass capillary tube a, 4-bypass capillary tube b.
Detailed Description
The invention is further described with reference to the drawings and the implementation.
Referring to fig. 1, the capillary steam-mixing supercavitation jet noise suppression device comprises a throttling capillary 1, an evaporator inlet transition pipe 2 and a bypass capillary a, wherein the outer diameter of the bypass capillary a is 1.8-2.5mm, the inner diameter of the bypass capillary a is 0.6-0.7mm, the total length of the bypass capillary a is 200mm, the length of the bypass capillary a inserted into the front end of the evaporator inlet transition pipe 2 is 10mm, and the distance from the inserted front end to the outlet of the throttling capillary 1 is 10 mm; the length of the bypass capillary tube a inserted into the rear end of the evaporator inlet transition tube 2 is 10mm, the distance between the inserted rear end and the outlet of the throttling capillary tube 1 is 170mm, and the connection mode of all parts is oxygen welding.
Referring to fig. 2, the capillary steam-mixing supercavitation jet noise suppression device comprises a throttling capillary 1, an evaporator inlet transition pipe 2, a bypass capillary a and a bypass capillary b; the outer diameter of the bypass capillary tube a is 1.8-3.5mm, the inner diameter is 0.6-1.5mm, the total length of the bypass capillary tube a is 200mm, the length of the bypass capillary tube a inserted into the front end of the evaporator inlet transition tube 2 is 10mm, and the distance from the inserted front end to the outlet of the throttle capillary tube 1 is 10 mm; the length of the bypass capillary tube a inserted into the rear end of the evaporator inlet transition tube 2 is 10mm, and the distance between the inserted rear end and the outlet of the throttling capillary tube 1 is 170 mm; the outer diameter of the bypass capillary tube b is 1.8-3.5mm, the inner diameter of the bypass capillary tube b is 0.6-1.5mm, the total length of the bypass capillary tube b is 400mm, the length of the bypass capillary tube b inserted into the front end of the evaporator inlet transition tube 2 is 10mm, and the distance between the inserted front end and the outlet of the throttling capillary tube 1 is 30 mm; the length of the bypass capillary tube b inserted into the rear end of the evaporator inlet transition tube 2 is 10mm, and the distance between the inserted rear end and the outlet of the throttling capillary tube 1 is 190 mm; the connection mode of each part is oxygen welding.
The capillary steam-mixing supercavitation jet noise suppression device comprises a throttling capillary tube 1, an evaporator inlet transition tube 2 and a bypass capillary tube a, wherein the outer diameter of the bypass capillary tube a is 1.8-2.5mm, the inner diameter of the bypass capillary tube a is 0.6-0.7mm, the total length of the bypass capillary tube a is 500mm, the length of the bypass capillary tube a inserted into the front end of the evaporator inlet transition tube 2 is 10mm, and the distance between the inserted front end and the outlet of the throttling capillary tube 1 is 10 mm; the length of the bypass capillary tube a inserted into the rear end of the evaporator inlet transition tube 2 is 10mm, the distance between the inserted rear end and the outlet of the throttling capillary tube 1 is 470mm, and the connection mode of all parts is oxygen welding.
The invention has wide application, is not only suitable for common refrigerating devices such as refrigerators, air conditioners and the like, but also can be used for refrigerating systems in the fields of machinery, metallurgy, petroleum, chemical industry, food preservation, artificial environment, biological pharmacy and the like.
Claims (7)
1. The utility model provides a capillary mixes vapour supercavitation and sprays noise suppression device which characterized in that: the capillary tube steam-mixing super-cavitation jet noise suppression device is characterized in that a bypass capillary tube is connected between an outlet of a throttling device and an inlet tube of an evaporator and the front middle part of the evaporator, so that a gaseous refrigerant with a pressure slightly higher than the jet pressure of the capillary tube in the inlet tube of the evaporator flows back to the outlet of the throttling device along the bypass capillary tube to mix steam locally to form a super-cavitation phenomenon, thereby reducing extra noise generated at the outlet of the throttling device due to low local pressure, and after being converged, the refrigerant in a bypass tube flows back to the inside of the evaporator to complete refrigerant circulation; the device comprises a throttling capillary tube (1) of a noise suppression device, an evaporator inlet tube (2), a bypass capillary tube a (3) and a bypass capillary tube b (4);
the noise suppression device consists of a throttling capillary tube, an evaporator inlet tube, a bypass capillary tube, an auxiliary pipeline and a connecting piece; the two ends of the bypass capillary tube are communicated with the inlet tube of the evaporator to form a bypass loop for bypassing the refrigerant gas.
2. The capillary steam-doped supercavitation jet noise suppression device according to claim 1, wherein: the throttling capillary tubes are connected with the evaporator, the diameter of each capillary tube is 0.5-3.5mm, the length of each capillary tube extending into the evaporator is 5-50 mm, and the number of the throttling capillary tubes is 1-4.
3. The capillary steam-doped supercavitation jet noise suppression device according to claim 1, wherein: the pipe diameter of the inlet pipe of the evaporator is 2mm-50mm, the wall thickness is 0.5mm-3mm, and the length is 50mm-20000 mm.
4. The capillary steam-doped supercavitation jet noise suppression device according to claim 1, wherein: the bypass capillary tube is connected with the evaporator, the inner diameter of the bypass capillary tube is 0.5-3.5mm, the length of the bypass capillary tube extending into the evaporator is 5-250 mm, the distance between two ports of the bypass loop is 40-480mm, and the number of the bypass throttle capillary tubes is 1-4.
5. The capillary steam-doped supercavitation jet noise suppression device according to claim 1, wherein: one end of each bypass capillary tube is inserted from the tube wall above the inlet of the evaporator, the distance between the insertion opening and the inlet end is 5mm-30mm, the length is 0.5mm-5mm, a welded connection mode is adopted, one end of each bypass capillary tube is inserted from the upper part of the tube wall of the front middle part of the evaporator, the inner diameter of each bypass capillary tube is 0.5-3.5mm, the insertion length is 0.5mm-2mm, the length of each bypass capillary tube is 50mm-500mm, and the bypass capillary tubes are connected in a welded connection mode and are 1-4 in number.
6. The capillary steam-doped supercavitation jet noise suppression device according to claim 1, wherein: the connection mode adopts a rock ring or is welded together; the throttling capillary tube is welded with an inlet tube of the evaporator; the bypass capillary tube extends into the evaporator inlet and the middle part of the evaporator and is welded together, and the tube material is a metal pipeline which can be used in a refrigeration system.
7. The capillary steam-doped supercavitation jet noise suppression device according to claim 1, wherein: when the flow of the refrigerant is large, the number of the bypass capillaries can be increased to increase the steam mixing amount, so that the steam mixing supercavitation phenomenon is ensured to be realized, and the noise suppression effect is ensured when the flow of the refrigerant is changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010426518.7A CN111707022B (en) | 2020-05-19 | 2020-05-19 | Capillary steam-mixing super-cavitation jet noise suppression device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010426518.7A CN111707022B (en) | 2020-05-19 | 2020-05-19 | Capillary steam-mixing super-cavitation jet noise suppression device |
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| CN111707022A CN111707022A (en) | 2020-09-25 |
| CN111707022B true CN111707022B (en) | 2021-04-30 |
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| CN202010426518.7A Expired - Fee Related CN111707022B (en) | 2020-05-19 | 2020-05-19 | Capillary steam-mixing super-cavitation jet noise suppression device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113154174A (en) * | 2021-04-16 | 2021-07-23 | 中南大学 | Device for mixing steam, super-cavitation explosion prevention and reducing water loss of urban water delivery and distribution pipe |
| CN113915805A (en) * | 2021-06-21 | 2022-01-11 | 中南大学 | Bidirectional throttle pipe steam-mixing super-cavitation jet noise suppression device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08110122A (en) * | 1994-10-07 | 1996-04-30 | Nippondenso Co Ltd | Evaporator for cooling equipment |
| CN102767923A (en) * | 2012-06-26 | 2012-11-07 | 广东美的暖通设备有限公司 | Throttling device and air conditioner adopting same |
| CN108168131A (en) * | 2017-12-28 | 2018-06-15 | 中南大学 | The refrigeration system of one stage of compression two-step throttle noise reduction |
| CN108518897A (en) * | 2018-05-28 | 2018-09-11 | 珠海格力电器股份有限公司 | Throttle filter assemblies and air conditioner |
| CN207881311U (en) * | 2017-12-28 | 2018-09-18 | 青岛海尔智能技术研发有限公司 | A kind of vacuum transition pipe and refrigerant denoising device |
| CN109595855A (en) * | 2017-09-30 | 2019-04-09 | 青岛海尔智能技术研发有限公司 | A kind of the noise reduction connector and refrigerating plant of capillary and evaporator |
| CN110455000A (en) * | 2019-07-24 | 2019-11-15 | 中南大学 | Novel energy-conserving noise reduction cooling cycle system |
-
2020
- 2020-05-19 CN CN202010426518.7A patent/CN111707022B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08110122A (en) * | 1994-10-07 | 1996-04-30 | Nippondenso Co Ltd | Evaporator for cooling equipment |
| CN102767923A (en) * | 2012-06-26 | 2012-11-07 | 广东美的暖通设备有限公司 | Throttling device and air conditioner adopting same |
| CN109595855A (en) * | 2017-09-30 | 2019-04-09 | 青岛海尔智能技术研发有限公司 | A kind of the noise reduction connector and refrigerating plant of capillary and evaporator |
| CN108168131A (en) * | 2017-12-28 | 2018-06-15 | 中南大学 | The refrigeration system of one stage of compression two-step throttle noise reduction |
| CN207881311U (en) * | 2017-12-28 | 2018-09-18 | 青岛海尔智能技术研发有限公司 | A kind of vacuum transition pipe and refrigerant denoising device |
| CN108518897A (en) * | 2018-05-28 | 2018-09-11 | 珠海格力电器股份有限公司 | Throttle filter assemblies and air conditioner |
| CN110455000A (en) * | 2019-07-24 | 2019-11-15 | 中南大学 | Novel energy-conserving noise reduction cooling cycle system |
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